作者jonerty (宝爷)
看板trans_math
标题[考古] 中兴91
时间Tue Jul 5 22:16:38 2005
1.
find a function f and a constant c such that
x
S tf(t) dt=sinx-xcosx-1/2(x^2),for all x.
c
这题怎麽找他的常数C阿...快疯了...
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◆ From: 59.121.139.39
1F：推 amymayyam:我在想是不是洛尔定理.....140.127.179.227 07/05
2F：→ amymayyam:先两边微分吧 然後用洛尔的样子....140.127.179.227 07/05
3F：推 iamseed:c=0吗 还是.. 61.216.131.193 07/05
4F：推 wakke:sinc-ccosc-1/2c^2=0 so c=0 61.228.32.114 07/05
5F：推 iamseed:跟我想的一样 ｘ＝ｃ积分等於０ 61.216.131.193 07/05
6F：推 amymayyam:不是两边微分 c带进去 让f(c)=0?140.127.179.227 07/05
7F：推 wakke:直接带c左边就等於0了阿 61.228.32.114 07/05